CN112599822A - Air supply and filtration system for hydrogen fuel cell and control method - Google Patents
Air supply and filtration system for hydrogen fuel cell and control method Download PDFInfo
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- CN112599822A CN112599822A CN202011486613.2A CN202011486613A CN112599822A CN 112599822 A CN112599822 A CN 112599822A CN 202011486613 A CN202011486613 A CN 202011486613A CN 112599822 A CN112599822 A CN 112599822A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04746—Pressure; Flow
- H01M8/04753—Pressure; Flow of fuel cell reactants
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0273—Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0276—Sealing means characterised by their form
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04992—Processes for controlling fuel cells or fuel cell systems characterised by the implementation of mathematical or computational algorithms, e.g. feedback control loops, fuzzy logic, neural networks or artificial intelligence
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y02E60/50—Fuel cells
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Abstract
The invention relates to an air supply and filtration system for a hydrogen fuel cell and a control method, the air supply and filtration system comprises an electric pile, an air inlet and a water outlet, wherein the air inlet is connected with an air compressor, at least two parallel ventilation pipelines are arranged between the air compressor and the air inlet, a filtration component is arranged on each ventilation pipeline, an air supply control valve is arranged at the air inlet end of the filtration component, a filtration box body is arranged on each ventilation pipeline, a driving component for realizing the drawing and inserting actions is arranged outside the filtration box body, and the driving component drives the filtration component to move; a first pressure sensor is arranged in front of the filtering component, and a second pressure sensor is arranged behind the filtering component; the automatic cleaning of the blocked filtering component can be realized under the condition of no shutdown by independently controlling the ventilation pipelines connected in parallel. The blockage of the filter assembly can be judged by judging the pressure in the ventilation pipeline in front of and behind the filter assembly, so that accurate maintenance is realized; thereby reducing labor and maintenance cost and improving the power generation efficiency of the hydrogen fuel cell.
Description
Technical Field
The invention relates to the technical field of hydrogen fuel cells, in particular to an air supply filtering system for a hydrogen fuel cell and a control method.
Background
A hydrogen fuel cell is a power generation device that directly converts chemical energy of hydrogen and oxygen into electric energy, and its basic principle is a reverse reaction of electrolysis water, in which hydrogen and oxygen are supplied to an anode and a cathode, respectively, and after the hydrogen diffuses outward through the anode and reacts with an electrolyte, electrons are emitted to the cathode through an external load. Since the hydrogen fuel cell generates only water and heat, operates quietly, and has a power generation efficiency of 50% or more, it has advantages of no pollution, no noise, and high efficiency, and the hydrogen fuel cell is increasingly used in various industries.
In the process of generating electric energy by the hydrogen fuel cell at present, based on cost consideration, air is generally used for replacing oxygen, the air is directly pumped into a pipeline by an air compressor and is directly sent into a galvanic pile after passing through a filter screen in the pipeline, however, the air has more impurities, so that the filter screen in the pipeline is easy to block, and the air quantity entering the hydrogen pile can not meet the requirement, thereby influencing the chemical reaction in the galvanic pile and reducing the efficiency of the hydrogen fuel cell; the event needs to be maintained the filter screen, need to close hydrogen fuel cell stop work this moment, needs the manual work to dismantle the filter screen simultaneously and washs, later installs hydrogen fuel cell again and continues work, and this kind of operation greatly reduced hydrogen fuel cell's efficiency, increased the cost of labor simultaneously.
Disclosure of Invention
The invention aims to provide an air supply and filtration system for a hydrogen fuel cell and a control method, wherein the air supply and filtration system can clean a filter screen on line and does not affect the efficiency.
The technical scheme adopted by the invention for solving the technical problems is as follows: an air supply and filtration system for a hydrogen fuel cell comprises a galvanic pile, an air inlet and a water outlet, wherein the air inlet and the water outlet are arranged on the galvanic pile, an air compressor is connected to the air inlet and supplies air to the galvanic pile, at least two parallel vent pipelines are arranged between the air compressor and the air inlet, a filtration component is arranged on each vent pipeline, an air supply control valve is arranged at the air inlet end of the filtration component, a filtration box body used for inserting the filtration component is arranged on each vent pipeline, a driving component used for realizing the drawing and inserting actions is arranged outside the filtration box body, and the driving component drives the filtration component to move; a first pressure sensor is arranged on the air duct in front of the filtering component, and a second pressure sensor is arranged on the air duct behind the filtering component.
It is further specific the other filter screen that sets up of filtration box wash the case, drive assembly shift filter assembly between filtration box and filter screen washing case the filter screen wash the case on set up and wash the import and wash the export, wash import and delivery port lead to pipe intercommunication the water pipe on set up and wash the control valve.
Further specifically, the filter screen cleaning box is provided with a gas inlet and a gas outlet, the gas inlet is provided with a third pressure sensor, the gas outlet is provided with a fourth pressure sensor, the gas inlet is provided with a blowing control valve, and the gas inlet is filled with nitrogen.
Further specifically, the driving assembly is a hydraulic cylinder or an air cylinder arranged on the filter screen cleaning box, and a shaft of the hydraulic cylinder or the air cylinder is fixed on the filter assembly.
Further specifically, drive assembly including set up in the filter screen wash the case and filter the screw rod of box both sides, set up nut and drive screw rod pivoted motor on the screw rod, the nut be fixed in on the filter assembly.
Further specifically, the filtering component comprises a rectangular outer frame, a filter screen arranged inside the rectangular outer frame and a sealing ring arranged on the side edge of the rectangular outer frame.
More specifically, the air supply filter system further comprises a hydrogen fuel cell management system.
A method of controlling an air supply filter system,
s1, starting the system, wherein the first air inlet branch is opened, other branches are closed, and the system operates normally;
s2, when the filter assembly on the first air inlet branch is blocked, firstly opening any other branch to continue supplying air, and then closing the first air inlet branch;
and S3, taking down the filter assembly on the first air inlet branch for cleaning, and reinstalling the filter assembly on the first air inlet branch after cleaning.
More specifically, the method for determining that the filter assembly is blocked in step S2 is to collect and compare pressure values detected by the first pressure sensor and the second pressure sensor, and if the pressure value detected by the second pressure sensor is less than 90% of the pressure value of the first pressure sensor, the filter assembly is blocked.
More specifically, in step S3, the method for determining that the cleaning of the filter assembly is completed includes acquiring pressure values detected by the third pressure sensor and the fourth pressure sensor, and comparing the pressure values, and if the pressure value detected by the fourth pressure sensor is greater than 98% of the pressure value of the third pressure sensor, it is determined that the cleaning of the filter assembly is completed.
The invention has the beneficial effects that: by adopting the system and the control method, the cleaning operation of the filtering assembly can be realized on line by connecting at least two paths of ventilation pipelines in parallel, and the cleaning of the filtering assembly can be realized without closing the hydrogen fuel cell; the blockage of the filter assembly can be judged by judging the pressure in the ventilation pipeline in front of and behind the filter assembly, so that accurate maintenance is realized; thereby reducing labor and maintenance cost and improving the power generation efficiency of the hydrogen fuel cell.
Drawings
FIG. 1 is a schematic view of the construction of an air supply filter system of the present invention;
FIG. 2 is a schematic structural view of a first mode of the drive assembly of the present invention;
FIG. 3 is a schematic structural view of a second mode of the drive assembly of the present invention;
fig. 4 is a flow chart illustrating the control method of the present invention.
In the figure: 1. a galvanic pile; 2. an air compressor; 3. a first main intake air path; 4. a second main intake path; 5. a first air intake branch; 6. a second air intake branch; 7. a filter box body; 8. a filter assembly; 9. a filter screen cleaning box; 10. a gas supply control valve; 11. a first pressure sensor; 12. a second pressure sensor; 13. a water pipe; 14. cleaning the control valve; 15. a blow control valve; 16. a third pressure sensor; 17. a fourth pressure sensor; 81. a rectangular outer frame; 82. filtering with a screen; 83. a hydraulic cylinder; 84. a screw; 85. a nut; 86. an electric motor.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.
The present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, an air supply filtering system for a hydrogen fuel cell includes an electric pile 1, an air inlet and a water outlet, which are arranged on the electric pile 1, an air compressor 2 is connected to the air inlet, the air compressor 2 supplies air to the electric pile 1, at least two parallel air ducts are arranged between the air compressor 2 and the air inlet, in the present solution, two, namely, a first air inlet branch 5 and a second air inlet branch 6 are adopted, an outlet of the air compressor 2 is connected with a first main air inlet path 3, the first air inlet branch 5 and the second air inlet branch 6 are both communicated with a first main air inlet path 3, the first air inlet branch 5 is communicated with the rear end of the second air inlet branch 6 and is connected with a second main air inlet path 4, and the second main air inlet path 4 is connected to the air inlet; each ventilating pipeline is provided with a filtering component 8, the air inlet end of the filtering component 8 is provided with an air supply control valve 10, the ventilating pipeline is provided with a filtering box body 7 for inserting the filtering component 8, the outside of the filtering box body 7 is provided with a driving component for realizing the drawing and inserting actions, and the driving component drives the filtering component 8 to move; a first pressure sensor 11 is arranged on the ventilation pipeline in front of the filter assembly 8, and a second pressure sensor 12 is arranged on the ventilation pipeline behind the filter assembly 8; that is, the first intake branch 5 and the second intake branch 6 are provided with a filter unit 8, an air supply control valve 10, a filter case 7, a drive unit, a first pressure sensor 11, and a second pressure sensor 12. Detect the pressure value of filtering component 8 both sides through first pressure sensor 11 and second pressure sensor 12 and compare to judge whether first air inlet branch 5 or second air inlet branch 6 take place to block up, if take place to block up then change into other branches and admit air and dismantle filtering component 8 simultaneously and carry out the cleaning operation.
In order to facilitate cleaning, a filter screen cleaning box 9 is arranged beside the filter box body 7, the driving assembly transfers the filter assembly 8 between the filter box body 7 and the filter screen cleaning box 9, when cleaning is needed, the driving assembly transfers the filter assembly 8 into the filter screen cleaning box 9, and after cleaning is finished, the driving assembly transfers the filter assembly 8 into the filter box body 7; a cleaning inlet and a cleaning outlet are arranged on the filter screen cleaning box 9, the cleaning inlet is communicated with a water outlet through a water pipe 13, a cleaning control valve 14 is arranged on the water pipe 13, and the filter assembly 8 is cleaned by water generated by the galvanic pile 1 without waste; wherein, filtering component 8 includes rectangle frame 81, set up in the inside filter screen 82 of rectangle frame 81 and set up the sealing washer on rectangle frame 81 side, other shapes can be made into as required to rectangle frame 81, the sealing washer sets up in the left side and the right side of rectangle frame 81, it is corresponding also can set up the sealing washer on filtering box 7 and filter screen washing case 9, its primary function makes filtering component 8 be in encapsulated situation, guarantee that inside gas can not leak, need certain water pressure when wasing simultaneously, can realize through the water pump, set up the water pump promptly on water pipe 13.
After cleaning, in order to blow the filter assembly 8 dry and blow off impurities attached to the filter screen 82, a gas inlet and a gas outlet are arranged on the filter screen cleaning box 9, nitrogen is introduced into the gas inlet, and a gas blowing control valve 15 is arranged on the gas inlet to control the opening and closing of the gas inlet.
Further, in order to judge whether the cleaning of the filter assembly 8 is finished, a third pressure sensor 16 is arranged at the gas inlet, and a fourth pressure sensor 17 is arranged at the gas outlet; detect the pressure value of filtering component 8 both sides through third pressure sensor 16 and fourth pressure sensor 17 and compare to judge whether cleaning of filtering component 8 is accomplished, if then stop the cleaning work and shift filtering component 8 to in filtering box 7 through drive assembly, if otherwise continue to use and blow and wash by water and clear up in turn.
For the purpose of automatic control and automatic flushing, the air supply and filtration system further includes a hydrogen fuel cell management system FCU, which is configured to receive pressure signals of the first pressure sensor 11, the second pressure sensor 12, the third pressure sensor 16 and the fourth pressure sensor 17 for processing and determining, and output control signals for controlling the opening and closing of the air supply control valve 10 and the air blowing control valve 15 of the first air intake branch 5 or the second air intake branch 6, the cleaning control valve 14 on the water pipe, the water pump and the like, and also for controlling the movement of the driving assembly.
In order to realize the transfer of filter assembly 8 in filtering box 7 and filter screen washing case 9, drive assembly can have multiple structural style, mainly adopts two kinds of forms in this scheme:
as shown in fig. 2, the first implementation is realized by using a hydraulic cylinder 83 or an air cylinder, the hydraulic cylinder 83 or the air cylinder is installed between a rectangular outer frame 81 of the filter assembly 8 and the filter screen cleaning box 9, the cylinder body of the hydraulic cylinder 83 or the air cylinder is fixed on the filter screen cleaning box 9, the shaft of the hydraulic cylinder 83 or the air cylinder is fixed on the rectangular outer frame 81, and the shaft of the hydraulic cylinder 83 or the air cylinder is driven to extend or retract through a control signal sent by the hydrogen fuel cell management system FCU to realize the transfer of the filter assembly 8.
As shown in fig. 3, the second method is realized by matching a screw 84 with a motor 86, the screw 84 is arranged on both sides of the filter screen cleaning box 9 and the filter box body 7, the two screws 84 can rotate around the axes thereof after being fixed, the two screws 84 are respectively provided with a nut 85, the two nuts 85 are respectively arranged on the two side frames of the rectangular outer frame 81 in a one-to-one correspondence manner, the two screws 84 can be controlled by two motors 86 or one motor 86 according to requirements, and the power output by the two screws can be better synchronized by controlling one motor 86 in the scheme.
Based on the above structure, a control method of the air supply filter system is provided, which is described in detail below with two intake branches as an example as shown in fig. 4.
S1, firstly, starting the system to enable the system to be in a normal working state, at this time, the FCU controls the air compressor 2 and the air supply control valve 10 of the first air inlet branch 5 to be opened, the air supply control valve 10 of the second air inlet branch 6 to be closed, the air compressor 2 supplies air to the electric pile 1 through the first air inlet branch 5, at this time, the pressure at the front end of the first air inlet branch 5 needs to be controlled at 170 and 190KPa, and when the pressure value is lower than 170KPa, the power of the air compressor 2 needs to be increased to perform pressurization operation.
And S2, judging whether the filtering component 8 on the first air inlet branch 5 is blocked or not, if so, sending a control signal by the FCU to open the air supply control valve 10 of the second air inlet branch 6, and then closing the air supply control valve 10 of the first air inlet branch 5, so that the air inlet is changed from the first air inlet branch 5 to the second air inlet branch 6 to continuously supply air to the stack 1.
In this step, the method for determining whether the filter module 8 is clogged is that the pressure values of the first pressure sensor 11 and the second pressure sensor 12 are collected in real time in the whole air supply process, and the two pressure value signals are transmitted to the FCU for comparison, and when the pressure value P2 detected by the second pressure sensor 12 is smaller than 90% of the pressure value P1 detected by the first pressure sensor 11, that is, P2 is smaller than 90% of P1, it is determined that the filter module 8 is clogged, and needs to be cleaned.
S3, taking down the filtering component 8 on the first air inlet branch 5 for cleaning, and reinstalling the filtering component 8 on the first air inlet branch 5 after cleaning, wherein the operation FCU controls the driving component to realize the transfer operation of the filtering component 8.
In the step, an automatic cleaning operation is performed on the filter assembly 8 on the first air inlet branch 5, the FCU controls the water pump, the cleaning control valve 14 and the air blowing control valve 15 to be opened, the automatic cleaning is performed through the water cleaning operation and the air blowing operation, the interval cleaning or the mixed cleaning is performed between the two, and finally whether the cleaning is completed or not needs to be judged, and the method for judging the completion of the cleaning of the filter assembly 8 includes the steps of collecting the pressure values of the third pressure sensor 16 and the fourth pressure sensor 17 in real time in the whole cleaning process, transmitting two pressure value signals to the FCU for comparison, and if the pressure value P4 detected by the fourth pressure sensor 17 is greater than 98% of the pressure value P3 detected by the third pressure sensor 16, namely P4 is greater than 98% P3, it is said that the cleaning of the filter assembly 8 is completed, and the filter assembly 8 can be inserted back into the filter box 7 through the.
In conclusion, through the use of the system and the control method, the cleaning operation of the filtering component 8 under the condition that the hydrogen fuel cell does not stop is realized, and the blockage of the filtering component 8 can be judged by judging the pressure in the ventilation pipeline in front of and behind the filtering component 8, so that the accurate maintenance is realized; thereby reducing labor and maintenance cost and improving the power generation efficiency of the hydrogen fuel cell.
It is to be emphasized that: the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (10)
1. An air supply and filtration system for a hydrogen fuel cell comprises an electric pile (1), an air inlet and a water outlet, wherein the air inlet is arranged on the electric pile (1), an air compressor (2) is connected to the air inlet, the air compressor (2) supplies air to the electric pile (1), and the air supply and filtration system is characterized in that at least two parallel vent pipelines are arranged between the air compressor (2) and the air inlet, a filtration component (8) is arranged on each vent pipeline, an air supply control valve (10) is arranged at the air inlet end of the filtration component (8), a filtration box body (7) for inserting the filtration component (8) is arranged on each vent pipeline, a driving component for realizing the drawing and inserting actions is arranged outside the filtration box body (7), and the driving component drives the filtration component (8) to move; a first pressure sensor (11) is arranged on the ventilation pipeline in front of the filtering component (8), and a second pressure sensor (12) is arranged on the ventilation pipeline behind the filtering component (8).
2. The air supply filter system for a hydrogen fuel cell according to claim 1, wherein a screen washing tank (9) is provided beside said filter housing (7), said driving unit transfers the filter unit (8) between the filter housing (7) and the screen washing tank (9), a washing inlet and a washing outlet are provided in said screen washing tank (9), said washing inlet and outlet are communicated through a water pipe (13), and a washing control valve (14) is provided in said water pipe (13).
3. The air supply filter system for a hydrogen fuel cell according to claim 2, wherein a gas inlet and a gas outlet are provided in said screen washing tank (9), a third pressure sensor (16) is provided at said gas inlet, a fourth pressure sensor (17) is provided at said gas outlet, a purge control valve (15) is provided at said gas inlet, and said gas inlet is supplied with nitrogen gas.
4. The air supply filter system for a hydrogen fuel cell according to claim 2, wherein said drive unit is a hydraulic cylinder (83) or an air cylinder provided on the screen washing tank (9), and a shaft of said hydraulic cylinder (83) or air cylinder is fixed to the filter unit (8).
5. The air supply filter system for a hydrogen fuel cell according to claim 2, wherein said drive assembly comprises a screw (84) provided on both sides of the filter screen washing tank (9) and the filter case body (7), a nut (85) provided on the screw (84), and a motor (86) for driving the screw (84) to rotate, said nut (85) being fixed to the filter assembly (8).
6. The air supply filter system for a hydrogen fuel cell according to claim 1, wherein the filter assembly (8) includes a rectangular outer frame (81), a filter mesh (82) provided inside the rectangular outer frame (81), and a gasket provided on a side of the rectangular outer frame (81).
7. The air supply filter system for a hydrogen fuel cell according to claim 6, wherein said air supply filter system further comprises a hydrogen fuel cell management system.
8. A method of controlling an air supply filter system,
s1, the system is started, wherein the first air inlet branch (5) is started, other branches are closed, and the system operates normally;
s2, when the filter assembly (8) on the first air inlet branch (5) is blocked, firstly opening any other branch to continue supplying air, and then closing the first air inlet branch (5);
s3, taking down the filtering component (8) on the first air inlet branch (5) for cleaning, and reinstalling the filtering component (8) on the first air inlet branch (5) after cleaning.
9. The control method of the air supply filter system according to claim 8, wherein the filter module (8) is judged to be clogged in step S2 by collecting and comparing pressure values detected by the first pressure sensor (11) and the second pressure sensor (12), and if the pressure value detected by the second pressure sensor (12) is less than 90% of the pressure value of the first pressure sensor (11), the filter module (8) is clogged.
10. The control method of the air supply filter system according to claim 8, wherein the step S3 judges that the filter assembly (8) is cleaned completely by collecting and comparing the pressure values detected by the third pressure sensor (16) and the fourth pressure sensor (17), and if the pressure value detected by the fourth pressure sensor (17) is greater than 98% of the pressure value of the third pressure sensor (16), the filter assembly (8) is cleaned completely.
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| CN113690906A (en) * | 2021-08-27 | 2021-11-23 | 山西图门新能源有限公司 | Photovoltaic power generation energy storage primary frequency modulation system based on carbon back electric capacity |
| CN115463494A (en) * | 2022-09-15 | 2022-12-13 | 无锡松煜科技有限公司 | Structure and method for preventing process furnace tail air extraction pipeline from being blocked |
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